Lavender, with its distinctive fragrance, is a favourite among UK gardeners. However, a common mistake in watering can harm these resilient plants. English lavender (Lavandula angustifolia) varieties like Hidcote and Munstead are popular for their ease of growth, provided they receive ample sunlight and well-drained soil.
Watering Young and Potted Lavender
Despite lavender's reputation for drought tolerance, young and potted plants require careful watering. The Royal Horticultural Society (RHS) advises that lavender planted in spring should be treated as delicate perennials, not drought-proof shrubs. They recommend watering regularly during the first summer, about once or twice a week.
In hot weather, compost in containers can dry out quickly, necessitating more frequent watering. Potted lavender is less tolerant than ground-planted specimens due to confined root space. Ensure water drains from the pot's holes, then let the compost nearly dry before watering again. Check moisture with your finger or a meter.
Established Lavender Care
After the first growing season, when lavender's taproot is well-established, additional watering becomes rare. In the UK, most established plants thrive on rainfall alone, needing irrigation only during prolonged droughts. Over-watering can cause root rot and weaken the plant.
How to Water Properly
Water at the base of the plant, avoiding flowers and leaves. Morning watering is best, allowing moisture to evaporate during the day and preventing fungal diseases like Botrytis and Septoria leaf spot. Botrytis appears as grey mould at the base, causing yellowing and drooping leaves. Septoria leaf spot shows as tiny grey marks on leaves, sapping plant vigour.
